->  TW> I just bought a 1998 Chev S10 Pickup and note that GM strongly 
->  TW> recommends against using any oil heaver then 30 Weight. 
->  TW> Interesting, Cannot immagine why.

-> Tighter tolerances?  Beats me...  I know that with most of the stuff I have
-> that has lots more miles on it I go with the 20W-50,  too.  The one car hasn't
-> gone that far up there yet,  so we still put 10W-40 in that one,  for now.

 It has 50.000 miles on it so should be well broken in. But I picked up
a Case of Castrol 10-30 for use in it anyhow.
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